Παραπομπή σε μορφή APA (7η εκδ.)

National Association of Secondary School Principals (U.S.). (1981). Schools in the middle. The Association.

Παραπομπή σε μορφή Chicago (17η εκδ.)

National Association of Secondary School Principals (U.S.). Schools in the Middle. Reston, Va.: The Association, 1981.

Παραπομπή σε μορφή MLA (9th εκδ.)

National Association of Secondary School Principals (U.S.). Schools in the Middle. The Association, 1981.